Time code decoder

Details Time code decoder Time code decoder

1985-05-24

1987-02-24

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Record editing

360 722, G11B 2702, G11B 1518

Patent

active

046461671

ABSTRACT:
A device for enabling detecting of the time code word prerecorded on each frame of videotape, for use in videotape production functions. The device is adapted to enable locking onto time code input signal frequencies rapidly and efficiently over a wide range of videotape running speeds. It is further adapted to enable detecting of errors in the time code input signal efficiently and effectively. The device includes an input signal frequency locking circuit, including at least one phase lock loop, responsive rapidly over a wide range of videotape running speeds for enabling decoding of difficult-to-read time code, and for generating the circuit clock frequency. The device further includes a valid sync word detecting circuit, including a counter, and a pulse counting circuit, including at least one counter, for detecting error in the time code signal and preventing loading of invalid time code.

REFERENCES:
patent: 4175267 (1979-11-01), Tachi
patent: 4300171 (1981-11-01), Tachi
patent: 4360843 (1982-11-01), Menezes et al.

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